单项选择题

Artificial flowers are used for scientific as well as for ______ purpose.

A. delicious
B. definite
C. decent
D. decorative
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单项选择题
Living in poverty, she sold for 1,000 dollars the ______ of her father's first works, which made him famous.
A. manuscript
B. document
C. file
D. duplicate
单项选择题
He is quite worn out from years of hard work. He is not the man ______ he was twenty years ago.
A. which
B. that
C. who
D. whom
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